Backpack



FIG. 1 is a front elevational view of a backpack showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown on the surface of the backpack, throughout theviews, are understood to represent stitching. And the broken linesshowing a hand strap and shoulder straps throughout the views illustrateportions of the design which form no part of the claim.

The ornamental design for a backpack, as shown and described.